WO2012121068A1

WO2012121068A1 - Method of producing optically active 1-amino-2-vinylcyclopropane carboxylic acid ester

Info

Publication number: WO2012121068A1
Application number: PCT/JP2012/055009
Authority: WO
Inventors: 利昭相川
Original assignee: 住友化学株式会社
Priority date: 2011-03-10
Filing date: 2012-02-22
Publication date: 2012-09-13
Also published as: EP2684864A4; CN103402972A; JP2012197264A; EP2684864A1; US20130338392A1

Abstract

In this method of producing optically active 1-amino-2-vinylcyclopropane carboxylic acid ester, a 1-amino-2-vinylcyclopropane carboxylic acid ester and an optically active tartaric acid or an optically active camphorsulfonic acid are reacted in a solvent, one diastereomeric salt of the obtained diastereomeric salt mixture is isolated, and the isolated diastereomeric salt is treated with an inorganic acid or a base. Thereby, it is possible to obtain an optically active 1-amino-2-vinylcyclopropane carboxylic acid ester with high optical purity.

Description

Process for producing optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester

The present invention relates to a method for producing an optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester.

The optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester is useful as, for example, a synthetic intermediate of a pharmaceutical product such as an antiviral agent. The racemate of ethyl acetate was optically resolved using di-p-toluoyl-D-tartaric acid, and the resulting optical purity was 55% e.e. e. (Hereinafter, ee represents the enantiomeric excess), the ethyl (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylate was converted to the methyl ester by transesterification, and then the enzyme reaction. Furthermore, by optically dividing, the optical purity is 97.2% e.e. e. Of (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylate is known (Journal of Organic Chemistry, 70, 5869-5879, 2005 (Supporting Information)). .
In order to obtain an optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester having a high optical purity, the above method uses an enzyme having a high substrate specificity, so that the optical purity is 55% e.e. e. The (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylic acid ethyl must be converted to a methyl ester, which makes the operation complicated.

The present invention provides a method by which an optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester having a high optical purity can be easily produced.
That is, the present invention relates to reacting 1-amino-2-vinylcyclopropanecarboxylic acid ester with optically active tartaric acid or optically active camphorsulfonic acid in a solvent, and diastereomeric salt mixture obtained. A method for producing an optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester by isolating a stereomeric salt and treating the isolated diastereomeric salt with an inorganic acid or base is provided.

Hereinafter, the present invention will be described in detail. The method for producing an optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester according to the present invention comprises 1-amino-2-vinylcyclopropanecarboxylic acid ester, optically active tartaric acid or optically active camphorsulfonic acid (hereinafter referred to as “active amino acid”). Is sometimes referred to as an optically active organic acid) in a solvent, and one diastereomeric salt of the resulting diastereomeric salt mixture is isolated (first step), Treating the stereomeric salt with an inorganic acid or base (second step).
The 1-amino-2-vinylcyclopropanecarboxylic acid ester used in the production method of the present invention is usually a (1R, 2S) isomer of 1-amino-2-vinylcyclopropanecarboxylic acid ester and (1S, 2R). ) It is preferable to use a mixture containing a large amount of either isomer. Its optical purity is, for example, 40% e.e. e. 95% e.e. e. Less, preferably 55% e.e. e. 95% e.e. e. Less, more preferably 70% e.e. e. 90% e. e. Less, more preferably 75% e.e. e. 85% e. e. Is less than.
The optically active organic acid used in the first step is optically active tartaric acid which is D-tartaric acid or L-tartaric acid, or optically active camphorsulfone such as D-10-camphorsulfonic acid and L-10-camphorsulfonic acid. It is an acid.
The amount of the optically active organic acid used in the first step is usually 1 mol or more with respect to 1 mol of 1-amino-2-vinylcyclopropanecarboxylic acid ester, and is 1 from the viewpoint of yield and economy. The ratio of mol to 4 mol is preferable, and the ratio of 1 mol to 2 mol is more preferable.
Examples of the solvent used for the reaction of 1-amino-2-vinylcyclopropanecarboxylic acid ester and optically active organic acid include pentane, hexane, isohexane, heptane, isoheptane, octane, isooctane, nonane, isononane, decane, and isodecane. , Undecane, dodecane, cyclopentane, cyclohexane, methylcyclohexane, t-butylcyclohexane, petroleum ether and other aliphatic hydrocarbon solvents; benzene, toluene, ethylbenzene, isopropylbenzene, t-butylbenzene, xylene, mesitylene, monochlorobenzene, mono Fluorobenzene, α, α, α-trifluoromethylbenzene, 1,2-dichlorobenzene, 1,3-dichlorobenzene, 1,2,3-trichlorobenzene, 1,2,4-trichlorobenzene Aromatic solvents: tetrahydrofuran, methyltetrahydrofuran, 1,4-dioxane, diethyl ether, dipropyl ether, diisopropyl ether, dibutyl ether, dipentyl ether, dihexyl ether, diheptyl ether, dioctyl ether, t-butyl methyl ether, cyclopentyl methyl Ether solvents such as ether, 1,2-dimethoxyethane, diethylene glycol dimethyl ether, anisole, diphenyl ether; methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, isobutyl alcohol, t-butyl alcohol, 1-pentanol, 2 -Pentanol, isopentyl alcohol, 1-hexanol, 2-hexanol, isohexyl alcohol, 1-heptanol 2-heptanol, 3-heptanol, isopeptyl alcohol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, ethylene glycol monoisobutyl ether, ethylene glycol mono alcohol solvents such as t-butyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monopropyl ether, diethylene glycol monoisopropyl ether, diethylene glycol monobutyl ether, diethylene glycol monoisobutyl ether, diethylene glycol mono t-butyl ether; Nitrile solvents such as ril, propionitrile, benzonitrile; chlorinated aliphatic hydrocarbon solvents such as dichloromethane, chloroform, 1,2-dichloroethane; methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate, butyl acetate, isobutyl acetate, Ester solvents such as t-butyl acetate, amyl acetate, isoamyl acetate, hexyl acetate, methyl propionate, ethyl propionate, propyl propionate, isopropyl propionate; acetone, methyl ethyl ketone, methyl propyl ketone, methyl isopropyl ketone, methyl butyl ketone, Ketone solvents such as methyl isobutyl ketone, diethyl ketone, cyclopentanone, cyclohexanone; dimethyl sulfoxide, sulfolane, N, N-dimethylformamide, N, N-dimethylacetamide, , N-dimethylpropionamide, N-methylpyrrolidone, γ-butyrolactone, dimethyl carbonate, diethyl carbonate, ethylene carbonate, propylene carbonate, 1,3-dimethyl-2-imidazolidinone, 1,3-dimethyl-3,4, Aprotic polar solvents such as 5,6-tetrahydro-2 (1H) -pyridinone; water; and mixtures thereof.
The solvent is preferably an aromatic solvent, a ketone solvent, an ester solvent, an alcohol solvent, an ether solvent, or a mixture thereof, more preferably any one of an aromatic solvent, a ketone solvent, an ester solvent, and an ether solvent. It is a mixed solvent of 1 type and an alcohol solvent, More preferably, it is a mixture of toluene and an alcohol solvent, Especially preferably, it is a mixture of toluene and ethanol, or a mixture of toluene and 2-propanol.
The amount of the solvent used is preferably 1 to 50 mL, more preferably 3 to 30 mL based on 1 g of 1-amino-2-vinylcyclopropanecarboxylic acid ester, although it depends on the solvent used.
The reaction of 1-amino-2-vinylcyclopropanecarboxylic acid ester with an optically active organic acid is carried out, for example, by mixing a solvent and 1-amino-2-vinylcyclopropanecarboxylic acid ester, and adding the resulting mixture to an optically active compound. It can also be carried out by adding an organic acid, or by mixing a solvent and an optically active organic acid and adding 1-amino-2-vinylcyclopropanecarboxylic acid ester to the resulting mixture.
The reaction temperature in the reaction between 1-amino-2-vinylcyclopropanecarboxylic acid ester and the optically active organic acid is not particularly limited, and is preferably 0 ° C. or higher and the boiling point of the solvent or lower, more preferably 0 ° C. or higher, 40 It is below ℃.
By isolating one diastereomeric salt preferentially precipitated from a mixture of diastereomeric salts formed in a solvent, one diastereomeric salt can be separated from the other diastereomeric salt. . Isolation of the diastereomeric salt which precipitates is performed by performing solid-liquid separation processes, such as filtration and a decantation, for example. The resulting diastereomeric salt is a salt of 1-amino-2-vinylcyclopropanecarboxylic acid ester and an optically active organic acid.
If precipitation of one diastereomeric salt is not observed from the mixture of diastereomeric salts in a solvent, after adding one of the diastereomeric salts prepared in advance as a seed crystal, a solution of the mixture of diastereomeric salts is added. One diastereomeric salt can be preferentially precipitated by cooling.
When precipitation of diastereomeric salt is observed, the solution may be cooled as it is, but in order to improve the optical purity of the diastereomeric salt to be precipitated, the solution is heated to dissolve the precipitate, and then cooled. By doing so, it is preferable to preferentially precipitate one diastereomeric salt, and in the precipitation of the diastereomeric salt, one diastereomeric salt prepared in advance can be used as a seed crystal. The higher the optical purity of the seed crystal, the better, preferably 90% e.e. e. Or more, more preferably 95% e.e. e. Or more, more preferably 98% e.e. e. Or more, particularly preferably 99% e.e. e. That's it.
When heating a solution of a mixture of diastereomeric salts, it is preferably heated to 30 ° C. or higher and lower than the boiling point of the solvent. As the cooling treatment, cooling to 0 to 25 ° C. is preferable, and in order to improve the optical purity of the diastereomeric salt to be precipitated, it is preferable to gradually cool.
After isolating one of the diastereomeric salts, it is preferable to wash the diastereomeric salt in order to improve the optical purity of the obtained diastereomeric salt. For example, the same solvent as that used in the reaction between 1-amino-2-vinylcyclopropanecarboxylic acid ester and the optically active organic acid is used for the washing treatment. It is preferable to perform a drying process after the cleaning process. The drying treatment can be performed under normal pressure or reduced pressure conditions, preferably at a temperature selected from the range of 20 to 80 ° C.
The liquid resulting from the above-described solid-liquid separation treatment contains the other diastereomeric salt, and the other diastereomeric salt can be obtained from the liquid phase by a conventional method.
The optical purity can be further improved by subjecting the diastereomeric salt to a purification treatment.
Recrystallization is preferred as the purification treatment. For example, a method in which a diastereomeric salt is dissolved in a solvent and cooled to precipitate a purified diastereomeric salt, a diastereomeric salt is dissolved in a solvent, and a purified diastereomer is added dropwise by adding a poor solvent. Purification can be carried out by a method of precipitating the dimer salt, a method of precipitating the diastereomeric salt by distilling off the solvent after dissolving the diastereomeric salt in a solvent, or a combination thereof. . In the purification treatment, one of the diastereomeric salts prepared in advance can be added as a seed crystal.
Examples of the solvent for dissolving the diastereomeric salt in the purification treatment include methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, isobutyl alcohol, t-butyl alcohol, 1-pentanol, and 2-pentanol. , Isopentyl alcohol, 1-hexanol, 2-hexanol, isohexyl alcohol, 1-heptanol, 2-heptanol, 3-heptanol, isopeptyl alcohol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether , Ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, ethylene glycol monoisobutyl ether, ethylene glycol mono t-butyl ether , Alcohol solvents such as diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monopropyl ether, diethylene glycol monoisopropyl ether, diethylene glycol monobutyl ether, diethylene glycol monoisobutyl ether, diethylene glycol mono t-butyl ether; water; and mixtures thereof, preferably Is an alcohol solvent, water, and a mixture thereof, more preferably methanol, ethanol, and a mixture thereof.
The amount of the solvent for dissolving the diastereomeric salt in the purification treatment can be appropriately adjusted depending on the solvent used, and is preferably 1 to 10 mL with respect to 1 g of the diastereomeric salt. The temperature at which the diastereomeric salt is dissolved is preferably 0 to 60 ° C, more preferably 10 to 40 ° C.
Examples of the poor solvent in the purification treatment include pentane, hexane, isohexane, heptane, isoheptane, octane, isooctane, nonane, isononane, decane, isodecane, undecane, dodecane, cyclopentane, cyclohexane, methylcyclohexane, t-butylcyclohexane, petroleum Aliphatic hydrocarbon solvents such as ether; benzene, toluene, ethylbenzene, isopropylbenzene, t-butylbenzene, xylene, mesitylene, monochlorobenzene, monofluorobenzene, α, α, α-trifluoromethylbenzene, 1,2-di Aromatic solvents such as chlorobenzene, 1,3-dichlorobenzene, 1,2,3-trichlorobenzene, 1,2,4-trichlorobenzene; tetrahydrofuran, methyltetrahydrofuran, 1,4-di Cyclic ether solvents such as xanthone; methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate, butyl acetate, isobutyl acetate, t-butyl acetate, amyl acetate, isoamyl acetate, hexyl acetate, methyl propionate, ethyl propionate, propionic acid Ester solvents such as propyl and isopropyl propionate; ketone solvents such as acetone, methyl ethyl ketone, methyl propyl ketone, methyl isopropyl ketone, methyl butyl ketone, methyl isobutyl ketone, diethyl ketone, cyclopentanone and cyclohexanone are preferable, preferably aromatic A solvent, more preferably toluene. The usage-amount of a poor solvent can be suitably adjusted with the precipitation degree of refinement | purification diastereomeric salt.
When the diastereomeric salt is dissolved in a solvent and cooled to precipitate the purified diastereomeric salt, it is preferably cooled to a temperature selected from the range of 0 to 25 ° C. Cooling per hour The temperature is preferably 3 to 10 ° C.
The obtained diastereomeric salt is, for example, (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylic acid ester or (1S, 2R) -1-amino-2-vinylcyclopropanecarboxylic acid ester and optically active. Specific examples thereof include salts with an organic acid, and specific examples thereof include a salt of ethyl (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylate and L-tartaric acid and (1R, 2S) -1-amino-2. -A salt of ethyl vinylcyclopropanecarboxylate and D-10-camphorsulfonic acid.
The second step can be performed by mixing the isolated diastereomeric salt with an inorganic acid or base, and an optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester can be obtained.
The inorganic acid to be mixed with the diastereomeric salt is usually one having higher acidity than the optically active organic acid, and specific examples include hydrochloric acid, phosphoric acid, and sulfuric acid. Preferred inorganic acids are hydrochloric acid and sulfuric acid. These inorganic acids can be used alone or in combination with a solvent described later.
The amount of inorganic acid used is usually 1 mol or more for hydrochloric acid and 0.5 mol or more for sulfuric acid with respect to 1 mol of diastereomeric salt.
Mixing of the diastereomeric salt and the inorganic acid is preferably performed in a solvent. Examples of such solvents include pentane, hexane, isohexane, heptane, isoheptane, octane, isooctane, nonane, isononane, decane, isodecane, undecane, dodecane, cyclopentane, cyclohexane, methylcyclohexane, t-butylcyclohexane, petroleum ether and the like. Aliphatic hydrocarbon solvent: benzene, toluene, ethylbenzene, isopropylbenzene, t-butylbenzene, xylene, mesitylene, monochlorobenzene, monofluorobenzene, α, α, α-trifluoromethylbenzene, 1,2-dichlorobenzene, 1, Aromatic solvents such as 1,3-dichlorobenzene, 1,2,3-trichlorobenzene, 1,2,4-trichlorobenzene; tetrahydrofuran, methyltetrahydrofuran, 1,4-dioxane, di Such as til ether, dipropyl ether, diisopropyl ether, dibutyl ether, dipentyl ether, dihexyl ether, diheptyl ether, dioctyl ether, t-butyl methyl ether, cyclopentyl methyl ether, 1,2-dimethoxyethane, diethylene glycol dimethyl ether, anisole, diphenyl ether, etc. Ether solvent; methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, isobutyl alcohol, t-butyl alcohol, 1-pentanol, 2-pentanol, isopentyl alcohol, 1-hexanol, 2-hexanol, iso Hexyl alcohol, 1-heptanol, 2-heptanol, 3-heptanol, isopeptyl alcohol, ethylene glycol mono Chill ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, ethylene glycol monoisobutyl ether, ethylene glycol mono t-butyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monopropyl Alcohol solvents such as ether, diethylene glycol monoisopropyl ether, diethylene glycol monobutyl ether, diethylene glycol monoisobutyl ether, diethylene glycol mono t-butyl ether; nitrile solvents such as acetonitrile, propionitrile, benzonitrile; ethyl acetate, propyl acetate, vinegar Ester solvents such as isopropyl acetate, butyl acetate, isobutyl acetate, t-butyl acetate, amyl acetate, isoamyl acetate; ketone solvents such as acetone, methyl ethyl ketone, methyl isopropyl ketone, methyl isobutyl ketone, cyclopentanone, cyclohexanone; dichloromethane, chloroform, Chlorinated aliphatic hydrocarbon solvents such as 1,2-dichloroethane; carboxylic acid solvents such as formic acid, acetic acid, propionic acid; water; and mixtures thereof.
The solvent used for mixing the diastereomeric salt and the inorganic acid is preferably a mixed solvent of an aromatic solvent and a ketone solvent or an alcohol solvent, and more preferably a mixed solvent of an aromatic solvent and an alcohol solvent. The amount of the solvent to be used is preferably 1 to 50 mL, more preferably 3 to 30 mL, per 1 g of diastereomeric salt.
Mixing of the diastereomeric salt and the inorganic acid can be performed, for example, by mixing the diastereomeric salt and the solvent and adding the inorganic acid thereto. The mixing is preferably performed within a range of 0 to 40 ° C, more preferably within a range of 0 to 30 ° C. The mixing time is not particularly limited, and is preferably in the range of 1 minute to 24 hours.
When the optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester is precipitated as an acid addition salt in the mixture obtained by mixing the diastereomeric salt and the inorganic acid, the acid addition salt is For example, the acid addition salt can be obtained by subjecting it to a solid-liquid separation process such as filtration or decantation. When precipitation of the acid addition salt is insufficient or when the acid addition salt is not precipitated, the obtained mixture is, for example, concentrated, mixed with a solvent in which the salt is difficult to dissolve, or cooled. By subjecting to treatment, an acid addition salt is precipitated, and the precipitated acid addition salt is subjected to solid-liquid separation treatment such as filtration or decantation, for example, to give an optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester. Can be obtained as an acid addition salt. The obtained acid addition salt can be purified, for example, by recrystallization or the like, or free of optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester in the same manner as in the base treatment of a diastereomeric salt described later. It can also be obtained as a base.
Specific examples of acid addition salts include addition salts of hydrochloric acid, phosphoric acid and sulfuric acid.
The filtrate obtained by the above-described solid-liquid separation treatment contains an optically active organic acid, and the optically active organic acid can be extracted from the filtrate by a conventional method and reused in the present invention.
Examples of the base to be mixed with the diastereomeric salt include alkali metal hydroxides such as potassium hydroxide and sodium hydroxide; alkali metal carbonates such as sodium carbonate and potassium carbonate; sodium methylate, sodium ethylate and potassium methylate. Examples thereof include alkali metal alcoholates such as lath and potassium ethylate. Preferred bases are alkali metal hydroxides, especially sodium hydroxide. The base can be used alone or in combination with a solvent described later.
The amount of the base used is preferably a ratio of 1 mol or more per 1 mol of the diastereomeric salt.
Mixing of the diastereomeric salt and the base is preferably performed in a solvent. Examples of the solvent include alcohol solvents such as methanol, ethanol, 2-propanol, 1-propanol, and 1-butanol; diethyl ether, t-butyl methyl ether, methisobutyl ether, diisopropyl ether, methylcyclopentyl ether, 1,2 -Ether solvents such as dimethoxymethane; aromatic solvents such as toluene, xylene and chlorobenzene; aliphatic hydrocarbon solvents such as hexane and cyclohexane; ketone solvents such as methyl ethyl ketone and methyl isobutyl ketone; esters such as ethyl acetate and t-butyl acetate Solvent; halogenated aliphatic hydrocarbon solvents such as dichloromethane; water; and mixtures thereof. The solvent is preferably an aromatic solvent, an alcohol solvent or water, or a mixture thereof, more preferably toluene or water, or a mixture thereof. When a base such as alkali metal hydroxide or alkali metal carbonate is used as the base, water alone or an organic solvent having low compatibility with water (for example, the above ether solvent, aromatic solvent, aliphatic hydrocarbon solvent) , Ketone solvents, ester solvents, halogenated aliphatic hydrocarbon solvents) and water are more preferably used as a mixture.
The amount of the solvent used for mixing the diastereomeric salt and the base is preferably 1 to 50 mL, more preferably 3 to 30 mL with respect to 1 g of the diastereomeric salt.
The diastereomeric salt and the base can be mixed, for example, by mixing the diastereomeric salt and the solvent and adding the base thereto. Mixing is preferably performed within a range of 0 to 60 ° C., more preferably within a range of 10 to 30 ° C. The mixing time is not particularly limited, and is preferably in the range of 1 minute to 24 hours.
Mixing of the diastereomeric salt and the base can be performed, for example, by the following method.
A base is added to the mixture of water and diastereomeric salt to make the aqueous layer of the mixture basic (preferably pH 8.5 or higher), and an organic solvent having low compatibility with water is added to the resulting mixture. By subjecting to a liquid separation treatment, an organic layer containing an optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester can be obtained. If this organic layer is washed with water as necessary and then concentrated, an optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester can be obtained as a free base. When an alkali metal alcoholate is used as the base and an alcohol solvent is used as the solvent, the alkali metal salt of the optically active organic acid can be precipitated, and the precipitate is filtered off and the resulting filtrate is concentrated. The optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester can be isolated as a free base. The obtained optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester can be purified by, for example, column chromatography.
The aqueous layer obtained by the liquid separation treatment contains an optically active organic acid, and the optically active organic acid can be recovered from the aqueous layer by a conventional method and reused in the present invention. In addition, the optically active organic acid can be recovered from the alkali metal salt of the optically active organic acid filtered out as described above by a conventional method and reused in the present invention.
An optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester obtained by mixing a diastereomeric salt with a base is further mixed with an acid to form an optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester. It can also be obtained as an acid addition salt of an ester.
Examples of the acid mixed with the optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester include inorganic acids such as hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid and perchloric acid; and aromatics such as paratoluenesulfonic acid and benzenesulfonic acid. Aliphatic sulfonic acids such as methanesulfonic acid; aliphatic carboxylic acids such as acetic acid, propionic acid, citric acid, malic acid, succinic acid, lactic acid, maleic acid and fumaric acid; and phthalic acid, benzoic acid, Examples include aromatic carboxylic acids such as 4-nitrobenzoic acid and 4-chlorobenzoic acid.
The acid may be used alone or in combination with a solvent described later. The acid is preferably an inorganic acid, more preferably sulfuric acid.
The amount of acid used is preferably, for example, 1 mol or more for hydrochloric acid and 0.5 mol or more for sulfuric acid with respect to 1 mol of optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester.
The mixing of the optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester and the acid is preferably performed in a solvent. Examples of such solvents include pentane, hexane, isohexane, heptane, isoheptane, octane, isooctane, nonane, isononane, decane, isodecane, undecane, dodecane, cyclopentane, cyclohexane, methylcyclohexane, t-butylcyclohexane, petroleum ether and the like. Aliphatic hydrocarbon solvent: benzene, toluene, ethylbenzene, isopropylbenzene, t-butylbenzene, xylene, mesitylene, monochlorobenzene, monofluorobenzene, α, α, α-trifluoromethylbenzene, 1,2-dichlorobenzene, 1, Aromatic solvents such as 1,3-dichlorobenzene, 1,2,3-trichlorobenzene, 1,2,4-trichlorobenzene; tetrahydrofuran, methyltetrahydrofuran, 1,4-dioxane, di Such as til ether, dipropyl ether, diisopropyl ether, dibutyl ether, dipentyl ether, dihexyl ether, diheptyl ether, dioctyl ether, t-butyl methyl ether, cyclopentyl methyl ether, 1,2-dimethoxyethane, diethylene glycol dimethyl ether, anisole, diphenyl ether, etc. Ether solvent; methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, isobutyl alcohol, t-butyl alcohol, 1-pentanol, 2-pentanol, isopentyl alcohol, 1-hexanol, 2-hexanol, iso Hexyl alcohol, 1-heptanol, 2-heptanol, 3-heptanol, isopeptyl alcohol, ethylene glycol mono Chill ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, ethylene glycol monoisobutyl ether, ethylene glycol mono t-butyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monopropyl Alcohol solvents such as ether, diethylene glycol monoisopropyl ether, diethylene glycol monobutyl ether, diethylene glycol monoisobutyl ether, diethylene glycol mono t-butyl ether; nitrile solvents such as acetonitrile, propionitrile, benzonitrile; ethyl acetate, propyl acetate, vinegar Ester solvents such as isopropyl acetate, butyl acetate, isobutyl acetate, t-butyl acetate, amyl acetate, isoamyl acetate; ketone solvents such as acetone, methyl ethyl ketone, methyl isopropyl ketone, methyl isobutyl ketone, cyclopentanone, cyclohexanone; dichloromethane, chloroform, Chlorinated aliphatic hydrocarbon solvents such as 1,2-dichloroethane; water; and mixtures thereof.
The solvent used for mixing the optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester and the acid is preferably a mixture of an aromatic solvent and a ketone solvent or an alcohol solvent, more preferably an aromatic solvent and an alcohol. It is a mixture with a solvent. The amount of the solvent to be used is preferably 1 to 50 mL, more preferably 3 to 30 mL, with respect to 1 g of the optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester.
For mixing the optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester and the acid, for example, the optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester and the solvent are mixed, and the acid is added thereto. Can be done. The mixing is preferably performed within a range of 0 to 40 ° C, more preferably within a range of 0 to 30 ° C. The mixing time is not particularly limited, and is preferably in the range of 1 minute to 24 hours.
An acid addition salt of optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester is precipitated in the mixture obtained by mixing optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester and acid. In this case, the acid addition salt can be obtained by subjecting the acid addition salt to a solid-liquid separation treatment such as filtration or decantation. When precipitation of the acid addition salt is insufficient or when the acid addition salt is not precipitated, the obtained mixture is, for example, concentrated, mixed with a solvent in which the salt is difficult to dissolve, or cooled. By subjecting to treatment, the acid addition salt is precipitated, and the acid addition salt can be taken out by subjecting the precipitated acid addition salt to a solid-liquid separation treatment such as filtration or decantation. The extracted acid addition salt can be purified by, for example, recrystallization.
Specific examples of acid addition salts include addition salts of hydrochloric acid, phosphoric acid and sulfuric acid.
The optical purity of the obtained optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester is, for example, 85% e.e. e. For example, 90% e.e. e. For example, 98% e.e. e. That's it.
Specific examples of the obtained optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester are (1S, 2R) -1-amino-2-vinylcyclopropanecarboxylic acid ethyl, (1S, 2R) -1-amino- T-butyl 2-vinylcyclopropanecarboxylate, t-butyl (1S, 2R) -1-amino-2-vinylcyclopropanecarboxylate, methyl (1S, 2R) -1-amino-2-vinylcyclopropanecarboxylate , Ethyl (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylate, t-butyl (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylate, (1R, 2S) -1-amino Methyl-2-vinylcyclopropanecarboxylate and its enantiomers.
The 1-amino-2-vinylcyclopropanecarboxylic acid ester used in the production method of the present invention can be produced according to a known method. For example, Journal of Organic Chemistry, Vol. 70, pages 5869-5879, 2005. 1- (N-phenylmethyleneamino) -2-vinylcyclopropane obtained by reacting N-phenylmethyleneglycine ethyl ester with 1,4-dibromo-2-butene in the presence of a base by the method described in the year It can be produced by subjecting ethyl carboxylate to acid treatment or the like, and optically resolving the resulting racemic ethyl 1-amino-2-vinylcyclopropanecarboxylate with di-p-toluoyl-D-tartaric acid. it can. When 1-amino-2-vinylcyclopropanecarboxylic acid ester forms a salt with an acid other than the optically active organic acid, it is preferable to base-treat the salt before reacting with the optically active organic acid. .
The 1-amino-2-vinylcyclopropanecarboxylic acid ester used in the production method of the present invention has the formula (4-2)

(Wherein R ¹ Represents an alkyl group having 1 to 12 carbon atoms or an alkenyl group having 2 to 12 carbon atoms. )
It is preferable that it is a compound (compound (4-2)) shown by these, and a compound (4-2) is Formula (1).

(Wherein R ¹ Is as defined above, Ar ¹ Represents an optionally substituted phenyl group or an optionally substituted naphthyl group. )
A compound represented by formula (compound (1)) and formula (2)

(Where Y ¹ And Y ² Each independently represents a halogen atom, an alkanesulfonyloxy group having 1 to 6 carbon atoms, a perfluoroalkanesulfonyloxy group having 1 to 6 carbon atoms, or an optionally substituted benzenesulfonyloxy group. Here, the substituent of the benzenesulfonyloxy group is one or more substituents selected from the group consisting of an alkyl group having 1 to 6 carbon atoms, a halogen atom and a nitro group. )
And a compound (compound (2)) represented by the formula (3) obtained by reacting in the presence of an optically active quaternary ammonium salt.

(Wherein Ar ¹ And R ¹ Is as defined above. )
It is preferable that it is manufactured by imine hydrolysis of the compound (compound (3)) shown by these.
In this case, the obtained optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester has the formula (4)

(Wherein R ¹ Is as defined above and C ^{* 1} And C ^{* 2} Represents an asymmetric carbon atom and C ^{* 1} C in the R configuration ^{* 2} Is S configuration and C ^{* 1} C is an S configuration ^{* 2} Is the R configuration. )
It becomes the compound shown by these.
R ¹ As the alkyl group having 1 to 12 carbon atoms represented by, for example, methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, t-butyl group, pentyl group, hexyl group, heptyl group, octyl A linear or branched alkyl group having 1 to 12 carbon atoms such as a group, nonyl group, decyl group, undecyl group and dodecyl group, and a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, and And a cyclic alkyl group having 3 to 12 carbon atoms such as cyclooctyl group, R ¹ Examples of the alkenyl group having 2 to 12 carbon atoms represented by the formula include linear or branched alkenyl groups such as ethenyl group, 2-propenyl group, 2-butenyl group and 3-methyl-2-butenyl group And cyclic alkenyl groups such as a 1-cyclohexenyl group.
R ¹ Is preferably an alkyl group having 1 to 12 carbon atoms, more preferably a methyl group, an ethyl group or a t-butyl group, and still more preferably a methyl group or an ethyl group.
In Formula (1) and Formula (3), Ar ¹ Although the phenyl group or naphthyl group represented by these may be substituted, examples of the substituent include at least one group selected from the following group P1.
<Group P1>
An alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, a halogen atom, a nitro group, a cyano group, and a trifluoromethyl group;
In the group P1, examples of the alkyl group having 1 to 12 carbon atoms include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a t-butyl group, a pentyl group, a hexyl group, a heptyl group, and an octyl group. , A linear or branched alkyl group having 1 to 12 carbon atoms such as nonyl group, decyl group, undecyl group and dodecyl group, and cyclopropyl group, cyclobutyl group, cyclopentyl group, cyclohexyl group, cycloheptyl group and cyclo Examples thereof include cyclic alkyl groups having 3 to 12 carbon atoms such as octyl group; examples of alkoxy groups having 1 to 12 carbon atoms include methoxy group, ethoxy group, propyloxy group, isopropyloxy group, butyloxy group, and isobutyloxy group. T-butyloxy group, pentyloxy group, hexyloxy group, heptyloxy group and Linear or branched alkoxy groups having 1 to 12 carbon atoms such as octyloxy and cyclopropyloxy, cyclobutyloxy, cyclopentyloxy, cyclohexyloxy, cycloheptyloxy and cyclooctyloxy And a cyclic alkyloxy group having 3 to 12 carbon atoms such as a group; examples of the halogen atom include a fluorine atom, a chlorine atom and a bromine atom.
Ar ¹ An optionally substituted phenyl group and Ar ¹ Examples of the optionally substituted naphthyl group represented by the formula: phenyl group, 1-naphthyl group, 2-naphthyl group, 2-methylphenyl group, 2-methoxyphenyl group, 2-fluorophenyl group, 2- Chlorophenyl group, 2-bromophenyl group, 2-nitrophenyl group, 2-cyanophenyl group, 2- (trifluoromethyl) phenyl group, 3-methylphenyl group, 3-methoxyphenyl group, 3-fluorophenyl group, 3 -Chlorophenyl group, 3-bromophenyl group, 3-nitrophenyl group, 3-cyanophenyl group, 3- (trifluoromethyl) phenyl group, 4-methylphenyl group, 4-methoxyphenyl group, 4-fluorophenyl group, 4-chlorophenyl group, 4-bromophenyl group, 4-nitrophenyl group, 4-cyanophenyl group, 4- (trifluoro Romechiru) phenyl group, 2,3-dichlorophenyl group, 2,4-dichlorophenyl group, and a 3,4-dichlorophenyl group, and 3,4,5-trichlorophenyl groups.
Ar ¹ Is preferably an optionally substituted phenyl group, more preferably an optionally halogenated phenyl group, still more preferably a phenyl group or a 4-chlorophenyl group.
Y in formula (2) ¹ And Y ² In the above, examples of the halogen atom include a chlorine atom, a bromine atom and an iodine atom. Examples of the alkanesulfonyloxy group having 1 to 6 carbon atoms include a methanesulfonyloxy group, an ethanesulfonyloxy group, a propanesulfonyloxy group, and a butane. Examples thereof include a sulfonyloxy group, a pentanesulfonyloxy group, and a hexanesulfonyloxy group. Examples of the perfluoroalkanesulfonyloxy group having 1 to 6 carbon atoms include a trifluoromethanesulfonyloxy group, a pentafluoroethanesulfonyloxy group, and a perfluoropropanesulfonyloxy group. And perfluorohexanesulfonyloxy group.
Y in formula (2) ¹ And Y ² In the above, each hydrogen atom in the benzenesulfonyloxy group may be independently substituted with, for example, a group selected from the group consisting of an alkyl group having 1 to 6 carbon atoms, a halogen atom and a nitro group. Examples of the alkyl group having 1 to 6 carbon atoms include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, and t-butyl. Examples of the halogen atom include a fluorine atom, a chlorine atom, and a bromine atom. It is done. Examples of the optionally substituted benzenesulfonyloxy group include 4-methylbenzenesulfonyloxy group, 2-nitrobenzenesulfonyloxy group, 3-nitrobenzenesulfonyloxy group, 4-nitrobenzenesulfonyloxy group, and 2,4-dinitrobenzenesulfonyl. Examples thereof include an oxy group, a 4-fluorobenzenesulfonyloxy group, and a pentafluorobenzenesulfonyloxy group.
Y ¹ And Y ² Are preferably each independently a chlorine atom, a bromine atom or a methanesulfonyloxy group, more preferably a bromine atom.
Specific examples of compound (1) are N-phenylmethyleneglycine ethyl ester, N-naphthalen-1-ylmethyleneglycine ethyl ester, N-naphthalen-2-ylmethyleneglycine ethyl ester, N-furan-2-ylmethyleneglycine. Ethyl ester, N- (4-methylphenyl) methyleneglycine ethyl ester, N- (4-methoxyphenyl) methyleneglycine ethyl ester, N- (4-fluorophenyl) methyleneglycine ethyl ester, N- (4-chlorophenyl) methylene Glycine ethyl ester, N- [4- (trifluoromethyl) phenyl] methylene glycine ethyl ester, N- (3-chlorophenyl) methylene glycine ethyl ester, N- (4-chlorophenyl) methylene glycine ethyl ester, - phenylmethylene glycine t- butyl ester, N- (4-chlorophenyl) methylene glycine t- butyl ester, N- phenylmethylene glycine methyl ester and N- (4-chlorophenyl) methylene glycine methyl ester.
The compound (1) is preferably N-phenylmethyleneglycine ethyl ester, N-naphthalen-1-ylmethyleneglycine ethyl ester or N- (4-chlorophenyl) methyleneglycine ethyl ester.
Compound (1) can be produced according to any known method, and a commercially available product can also be used.
Specific examples of the compound (2) include (E) -1,4-dibromo-2-butene, (E) -1,4-dichloro-2-butene, (E) -1,4-dimethanesulfonyloxy- 2-butene and (E) -1-bromo-4-chloro-2-butene. The compound (2) is preferably (E) -1,4-dibromo-2-butene or (E) -1,4-dichloro-2-butene, more preferably (E) -1,4-dibromo. -2-butene.
Compound (2) can be produced according to any known method, and a commercially available product can also be used.
Specific examples of the compound (3) are (1S, 2R) -1- (N-phenylmethylene) amino-2-vinylcyclopropanecarboxylate, (1S, 2R) -1- [N- (4-chlorophenyl) Methylene] amino-2-vinylcyclopropanecarboxylate ethyl, (1S, 2R) -1- (N-phenylmethylene) amino-2-vinylcyclopropanecarboxylate t-butyl, (1S, 2R) -1- [N -(4-Chlorophenyl) methylene] amino-2-vinylcyclopropanecarboxylate t-butyl, (1S, 2R) -1- (N-phenylmethylene) amino-2-vinylcyclopropanecarboxylate methyl, (1S, 2R ) -1- [N- (4-Chlorophenyl) methylene] amino-2-vinylcyclopropanecarboxylate methyl (1S, 2R) -1- (N-na) Ethyl (talen-1-ylmethylene) amino-2-vinylcyclopropanecarboxylate, ethyl (1R, 2S) -1- (N-phenylmethylene) amino-2-vinylcyclopropanecarboxylate, (1R, 2S) -1- [N- (4-Chlorophenyl) methylene] amino-2-vinylcyclopropanecarboxylate ethyl, (1R, 2S) -1- (N-phenylmethylene) amino-2-vinylcyclopropanecarboxylate t-butyl, (1R , 2S) -1- [N- (4-Chlorophenyl) methylene] amino-2-vinylcyclopropanecarboxylate t-butyl, (1R, 2S) -1- (N-phenylmethylene) amino-2-vinylcyclopropane Methyl carboxylate, (1R, 2S) -1- [N- (4-chlorophenyl) methylene] amino-2-vinylcyclo Methyl Ropankarubon acid, (1R, 2S) -1- (N-naphthalen-1-ylmethylene) amino-2-vinyl-cyclopropanecarboxylic acid ethyl, and optically active mixtures of their enantiomers thereof.
Examples of the optically active quaternary ammonium salt used in the reaction between the compound (1) and the compound (2) include, for example, cinchona alkaloid derivatives (for example, Tetrahedron Letters, Vol. 40, pages 8671-8694, 1999). ), Tartaric acid derivatives (see, for example, Tetrahedron, 60, 7743-7754, 2004), axially asymmetric spiro-type quaternary ammonium salts (eg, Journal of American Chemical Society, 122, 5228-5229). , 2000)), and preferred quaternary ammonium salts include those represented by the formula (5)

(Wherein Ar ² And Ar ^{2 '} Each independently represents an optionally substituted phenyl group. Ar ³ Represents an optionally substituted aromatic hydrocarbon group having 6 to 20 carbon atoms or an optionally substituted aliphatic hydrocarbon group having 1 to 20 carbon atoms. R ² Represents an optionally substituted aliphatic hydrocarbon group having 1 to 12 carbon atoms, R ³ Represents a straight-chain hydrocarbon group having 1 to 12 carbon atoms, or R ² And R ³ Together form a polymethylene group having 2 to 6 carbon atoms. R ⁴ , R ^{4 '} , R ⁵ , R ^{5 '} , R ⁶ And R ^{6 '} Each independently represents a hydrogen atom, an aliphatic hydrocarbon group having 1 to 12 carbon atoms or an alkoxy group having 1 to 12 carbon atoms. * Represents an asymmetric carbon atom. X ⁻ Represents a monovalent anion. )
The compound (compound (5)) shown by these is mentioned.
Ar in formula (5) ² And Ar ^{2 '} The phenyl group represented by may be substituted, and examples of the substituent include the same groups as those selected from the group P1 described above.
Ar ² And Ar ^{2 '} Examples of the optionally substituted phenyl group represented by: phenyl group, 2-methylphenyl group, 3-methylphenyl group, 4-methylphenyl group, 3,5-dimethylphenyl group, 3,4, 5-trimethylphenyl group, 2-t-butylphenyl group, 3-t-butylphenyl group, 4-t-butylphenyl group, 2-t-butyloxyphenyl group, 3-t-butyloxyphenyl group, 4- t-butyloxyphenyl group, 2-fluorophenyl group, 3-fluorophenyl group, 4-fluorophenyl group, 3,5-difluorophenyl group, 3,4,5-trifluorophenyl group, 2-chlorophenyl group, 3 -Chlorophenyl group, 4-chlorophenyl group, 3,5-dichlorophenyl group, 3,4,5-trichlorophenyl group, 2- (trifluoromethyl) phenyl Nyl group, 3- (trifluoromethyl) phenyl group, 4- (trifluoromethyl) phenyl group, 3,5-bis (trifluoromethyl) phenyl group and 3,5-difluoro-4- (trifluoromethyl) phenyl Groups.
Ar ² And Ar ^{2 '} Are preferably each independently 3-fluorophenyl group, 4-fluorophenyl group, 3,5-difluorophenyl group, 3,4,5-trifluorophenyl group or 3,5-bis (trifluoromethyl) phenyl group More preferably, each is independently 3,4,5-trifluorophenyl group or 3,5-bis (trifluoromethyl) phenyl group, and more preferably both 3,5-bis (trifluoromethyl) phenyl. It is a group.
Ar ³ Examples of the aromatic hydrocarbon group having 6 to 20 carbon atoms which may be substituted include, for example, phenyl group, 1-naphthyl group, 2-naphthyl group, benzyl group, 2-tolyl group, 1,5 -Diphenyl-3-pentyl group, bis (4-tolyl) methyl group, 1,3-diphenyl-2-propyl group and bis (3,4-dimethylphenyl) methyl group can be mentioned. Ar ³ Examples of the optionally substituted aliphatic hydrocarbon group represented by general formula (1) include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, C1-C20 linear alkyl group such as nonyl group, decyl group, undecyl group and dodecyl group, 1-methylethyl group, 1-methylpropyl group, 1-ethylpropyl group, 1-propylbutyl group, C1-C20 branched alkyl groups such as 1-butylpentyl group, 1-pentylhexyl group, 1-hexylheptyl group, 1-heptyloctyl group, 1-octylnonyl group and 1-nonylundecyl group, cyclopropyl A cyclic alkyl group having 3 to 20 carbon atoms, such as a group, cyclobutyl group, cyclopentyl group, cyclohexyl group, cycloheptyl group and cyclooctyl group; Group having 1 to 20 carbon atoms such as 1 group, 1-propenyl group, 2-propenyl group, 1-butenyl group, 1-pentenyl group, 1-hexenyl group, 1-heptenyl group, 1-octenyl group and 1-undecenyl group. Linear alkenyl groups, as well as ethynyl, 1-propynyl, 2-propynyl, 1-butynyl, 1-pentynyl, 1-hexynyl, 1-heptynyl, 1-octynyl and 1-undecynyl groups And straight-chain alkynyl groups having 2 to 20 carbon atoms such as
Ar ³ A substituent in the optionally substituted aromatic hydrocarbon group having 6 to 20 carbon atoms represented by the formula: ³ Examples of the substituent in the optionally substituted aliphatic hydrocarbon group having 1 to 20 carbon atoms represented by the formula (1) include at least one group selected from the following group P2.
<Group P2>
An alkoxy group having 1 to 12 carbon atoms, an alkenyloxy group having 3 to 12 carbon atoms, an alkynyloxy group having 3 to 12 carbon atoms, and an aromatic group having 6 to 12 carbon atoms.
In the group P2, examples of the alkoxy group having 1 to 12 carbon atoms include methoxy group, ethoxy group, propoxy group, isopropoxy group, butoxy group, isobutoxy group, t-butoxy group, pentyloxy group, hexyloxy group, heptyloxy Group, octyloxy group, nonyloxy group, decyloxy group, undecyloxy group and linear or branched alkoxy group such as dodecyloxy group, cyclopropyloxy group, cyclobutyloxy group, cyclopentyloxy group, cyclohexyloxy And cyclic alkoxy groups such as a cycloheptyloxy group and a cyclooctyloxy group. Examples of the alkenyloxy group having 3 to 12 carbon atoms include 2-propenyloxy group, 2-butenyloxy group, 2-methyl-2 -Butenyloxy group and 3-methyl 2-butenyloxy group is exemplified, and examples of the alkynyloxy group having 3 to 12 carbon atoms include 2-propynyloxy group and 2-butynyloxy group. Examples of the aromatic group having 6 to 12 carbon atoms include phenyl group , Naphthyl group, benzofuranyl group, benzothiophenyl group, benzopyrazolyl group, benzoisoxazolyl group, benzoisothiazolyl group, benzimidazolyl group, benzoxazolyl group, benzothiazolyl group, quinolinyl group and isoquinolinyl group . Here, 1 to 3 hydrogen atoms on the aromatic ring of the aromatic group may be each independently substituted with, for example, a substituent selected from the following group P3.
<Group P3>
A saturated hydrocarbon group having 1 to 12 carbon atoms, an aromatic group having 6 to 10 carbon atoms, a halogen atom, a nitro group, a trifluoromethyl group, a protected amino group, and a protected hydroxyl group.
In the group P3, examples of the saturated hydrocarbon group having 1 to 12 carbon atoms include methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, t-butyl group, pentyl group, hexyl group, heptyl group, An octyl group, a nonyl group, a decyl group, an undecyl group, a dodecyl group, a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, and a cyclooctyl group, and examples of the aromatic group having 6 to 10 carbon atoms include For example, phenyl group, 1-naphthyl group, 2-naphthyl group, 2-benzofuranyl group, 3-benzofuranyl group, 2-benzothiophenyl group, 2-benzopyrazolyl group, 3-benzoisoxazolyl group, 3-benzo Isothiazolyl group, 2-benzimidazolyl group, 2-benzoxazolyl group, 2-benzothiazolyl group , 2-quinolinyl group and 1-isoquinolinyl group, halogen atoms include, for example, fluorine atom, chlorine atom and bromine atom, and protected amino groups include, for example, benzylamino group, 2-methoxybenzylamino Group, 2,4-dimethoxybenzylamino group, acetylamino group, benzyloxycarbonylamino group, t-butoxycarbonylamino group and allyloxycarbonylamino group. Examples of the protected hydroxyl group include methoxy group and ethoxy group. , Propoxy group, isopropoxy group, butoxy group, isobutoxy group, t-butoxy group, pentyloxy group, hexyloxy group, heptyloxy group, octyloxy group, nonyloxy group, decyloxy group, undecyloxy group, dodecyloxy group, etc. Straight carbon number 1-12 A cyclic alkyloxy group having 3 to 12 carbon atoms such as a linear or branched alkoxy group, cyclopropyloxy group, cyclobutyloxy group, cyclopentyloxy group, cyclohexyloxy group, cycloheptyloxy group, cyclooctyloxy group, A methoxymethoxy group, a benzyloxy group, and an acetyloxy group are mentioned.
Ar ³ Are preferably 1-naphthyl group, phenyl group, cyclohexyl group, t-butyl group, 1-methoxy-1,1-di-p-tolylmethyl group, 1-methoxy-1-ethylpropyl group, 1-methoxy-1 -Butylpentyl group, 1-methoxy-1-hexylheptyl group, 1-methoxy-1-octylnonyl group, 3-phenyl-1-methoxy-1- (2-phenylethyl) propyl group, more preferably 1- Methoxy-1,1-di-p-tolylmethyl group, 1-methoxy-1-ethylpropyl group, 1-methoxy-1-butylpentyl group, 1-methoxy-1-hexylheptyl group, 1-methoxy-1-octylnonyl A 3-phenyl-1-methoxy-1- (2-phenylethyl) propyl group.
R ² Examples of the optionally substituted aliphatic hydrocarbon group having 1 to 12 carbon atoms represented by the formula: methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, t-butyl group, pentyl group , A hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, an undecyl group, a dodecyl group, etc., a linear or branched alkyl group having 1 to 12 carbon atoms, and a cyclopropyl group, a cyclobutyl group, a cyclopentyl group C3-C12 cyclic alkyl group such as cyclohexyl group, cycloheptyl group and cyclooctyl group, 2-propenyl group, 2-butenyl group, 2-methyl-2-butenyl group and 3-methyl-2-butenyl Examples thereof include alkenyl groups having 3 to 12 carbon atoms such as groups, and alkynyl groups having 3 to 12 carbon atoms such as 2-propynyl groups and 2-butynyl groups.
The position and number of substituents of the aliphatic hydrocarbon group having 1 to 12 carbon atoms are not particularly limited. The number of substituents is preferably 1 to 3, and when having a plurality of substituents, they may be the same substituent or two or more different substituents. As such a substituent, the same substituent as the substituent selected from the group P2 described above is preferably used.
R ² Is preferably a linear or branched alkyl group having 1 to 12 carbon atoms, more preferably a linear alkyl group having 1 to 8 carbon atoms, and still more preferably a methyl group.
R ³ Examples of the linear aliphatic hydrocarbon group having 1 to 12 carbon atoms represented by: For example, methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl Group, decyl group, undecyl group, dodecyl group and the like, linear alkyl group having 1 to 12 carbon atoms, ethenyl group, 1-propenyl group, 2-propenyl group, 1-butenyl group, 1-pentenyl group, 1-pentenyl group, C2-C12 linear alkenyl groups such as hexenyl group, 1-heptenyl group, 1-octenyl group and 1-undecenyl group, and ethynyl group, 1-propynyl group, 2-propynyl group, 1-butynyl And a straight-chain alkynyl group having 2 to 12 carbon atoms such as 1-pentynyl group, 1-hexynyl group, 1-heptynyl group, 1-octynyl group and 1-undecynyl group.
R ³ Is preferably a linear alkyl group having 1 to 12 carbon atoms, more preferably a linear alkyl group having 1 to 8 carbon atoms, and still more preferably a methyl group.
R ² And R ³ Together with each other to form a polymethylene group having 2 to 6 carbon atoms. Examples of the polymethylene group having 2 to 6 carbon atoms include a trimethylene group and a tetramethylene group.
R ⁴ , R ^{4 '} , R ⁵ , R ^{5 '} , R ⁶ And R ^{6 '} Examples of the aliphatic hydrocarbon group having 1 to 12 carbon atoms represented by: ² The same thing as the C1-C12 aliphatic hydrocarbon group in the C1-C12 aliphatic hydrocarbon group which may have a substituent represented by these is mentioned.
R ⁴ , R ^{4 '} , R ⁵ , R ^{5 '} , R ⁶ And R ^{6 '} Examples of the alkoxy group having 1 to 12 carbon atoms represented by the same group as the alkoxy group having 1 to 12 carbon atoms in the group P2 include the same.
R ⁴ And R ^{4 '} Are preferably each independently an alkoxy group having 1 to 12 carbon atoms, more preferably a methoxy group.
R ⁵ And R ^{5 '} Are preferably each independently an aliphatic hydrocarbon group having 1 to 12 carbon atoms, more preferably each independently a linear or branched alkyl group having 1 to 8 carbon atoms, and more preferably both t-Butyl group.
R ⁶ And R ^{6 '} Are preferably both hydrogen atoms.
X ⁻ Examples of the monovalent anion represented by the formula: hydroxide ion; halide ion such as chloride ion, bromide ion, iodide ion; methanesulfonate ion, ethanesulfonate ion, propanesulfonate ion, Alkanesulfonic acid ions having 1 to 6 carbon atoms such as butanesulfonic acid ions, pentanesulfonic acid ions, hexanesulfonic acid ions; benzenesulfonic acid ions, and the 1-3 hydrogen atoms contained in the benzenesulfonic acid are respectively Independently, alkyl groups having 1 to 6 carbon atoms such as methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, t-butyl group, pentyl group and hexyl group, and halogens such as fluorine atom and chlorine atom It may be substituted with an atom or a nitro group.
X ⁻ Is preferably a halide ion, more preferably a bromide ion.
Specific examples of the compound (5) include compounds represented by the following formulas (5-1) to (5-7) and enantiomers thereof.

Compound (5) is produced by the method described in Tetrahedron Letters, 44, 2003, pages 5629-5632 (6).

(Wherein Ar ² , Ar ^{2 '} R ⁴ , R ^{4 '} , R ⁵ , R ^{5 '} , R ⁶ And R ^{6 '} Is as defined above, and X represents a halogen atom such as a chlorine atom, a bromine atom or an iodine atom. )
Formula (7) produced by any known method from a compound represented by, for example, an amino acid

(Wherein R ² , R ³ , Ar ³ And * are as defined above. )
If necessary, it is produced by reacting in the presence of a base such as sodium bicarbonate and a solvent such as acetone.
The optical purity of the optically active quaternary ammonium salt is not limited, and in order to obtain a compound (3) having high optical purity, preferably 90% e.e. e. Or more, more preferably 95% e.e. e. Or more, more preferably 98% e.e. e. That's it.
The reaction between compound (1) and compound (2) is preferably performed in the presence of a base. Examples of the base used include alkali metal hydroxides such as sodium hydroxide, potassium hydroxide and cesium hydroxide; alkali metal carbonate compounds such as potassium carbonate and sodium carbonate; and tertiary amines such as triethylamine and diisopropylethylamine. It is done. The base is preferably an alkali metal hydroxide, more preferably potassium hydroxide.
The reaction between compound (1) and compound (2) is preferably performed in a solvent. Examples of the solvent include aliphatic hydrocarbon solvents, aromatic solvents, ether solvents, alcohol solvents, nitrile solvents, ester solvents, chlorinated aliphatic hydrocarbon solvents, aprotic polar solvents, and water. These solvents may be used alone or in combination of two or more.
Examples of the aliphatic hydrocarbon solvent include pentane, hexane, isohexane, heptane, isoheptane, octane, isooctane, nonane, isononane, decane, isodecane, undecane, dodecane, cyclopentane, cyclohexane, methylcyclohexane, t-butylcyclohexane and petroleum ether. Examples of the aromatic solvent include benzene, toluene, ethylbenzene, isopropylbenzene, t-butylbenzene, xylene, mesitylene, monochlorobenzene, monofluorobenzene, α, α, α-trifluoromethylbenzene, 1,2 -Dichlorobenzene, 1,3-dichlorobenzene, 1,2,3-trichlorobenzene and 1,2,4-trichlorobenzene, and ether solvents include, for example, tetrahydrofuran, Tyltetrahydrofuran, diethyl ether, dipropyl ether, diisopropyl ether, dibutyl ether, dipentyl ether, dihexyl ether, diheptyl ether, dioctyl ether, t-butyl methyl ether, cyclopentyl methyl ether, 1,2-dimethoxyethane, diethylene glycol dimethyl ether, anisole Examples of alcohol solvents include methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, isobutyl alcohol, t-butyl alcohol, 1-pentanol, 2-pentanol, isopentyl alcohol, and the like. 1-hexanol, 2-hexanol, isohexyl alcohol, 1-heptanol, 2-heptanol, 3-hepta , Isopeptyl alcohol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, ethylene glycol monoisobutyl ether, ethylene glycol mono t-butyl ether, diethylene glycol Examples include monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monopropyl ether, diethylene glycol monoisopropyl ether, diethylene glycol monobutyl ether, diethylene glycol monoisobutyl ether, and diethylene glycol mono t-butyl ether. Examples include ester solvents such as ethyl acetate, propyl acetate, isopropyl acetate, butyl acetate, isobutyl acetate, t-butyl acetate, amyl acetate and isoamyl acetate, and chlorinated aliphatic hydrocarbon solvents. Examples include dichloromethane, chloroform and 1,2-dichloroethane. Examples of aprotic polar solvents include dimethyl sulfoxide, sulfolane, N, N-dimethylformamide, N, N-dimethylacetamide, N, N-dimethyl. Propionamide, N-methylpyrrolidone, γ-butyrolactone, dimethyl carbonate, diethyl carbonate, ethylene carbonate, propylene carbonate, 1,3-dimethyl-2-imidazolidinone and 1,3-dimethyl-3,4,5,6- Tet Hydro -2 (1H) - pyridinone and the like. The solvent is preferably a mixture of water and a solvent other than water, more preferably a mixture of water and an aromatic solvent or an ether solvent, and water and toluene or t-butyl methyl ether. It is more preferable to use in combination.
In the reaction between the compound (1) and the compound (2), the amount of the compound (2) used is preferably 0.8 to 20 mol, more preferably 0, relative to 1 mol of the compound (1). .9 to 5 mole ratio.
In the reaction between the compound (1) and the compound (2), the amount of the optically active quaternary ammonium salt used is not limited, and preferably 0.00001 to 0.5 mol relative to 1 mol of the compound (1). The ratio is more preferably 0.001 to 0.1 mol.
In the reaction between the compound (1) and the compound (2), the amount of the base used is preferably 2 to 30 mol, more preferably 4 to 15 mol, relative to 1 mol of the compound (1). It is.
When the reaction between the compound (1) and the compound (2) is carried out in a solvent, the amount of the solvent used is not particularly limited, but is preferably 1 to 100 mL with respect to 1 g of the compound (1), and 3 to 30 mL. Is more preferable.
The reaction temperature is preferably in the range of −30 to 70 ° C., more preferably in the range of −10 to 40 ° C. The reaction time depends on the amount of optically active quaternary ammonium salt used, the reaction temperature, etc., but is preferably in the range of 1 to 120 hours.
The degree of progress of the reaction can be confirmed by an analytical means such as gas chromatography or liquid chromatography.
The mixing method of the reaction reagent is not specified. For example, the compound (1) is mixed with a solvent as necessary, the compound (2) and an optically active quaternary ammonium salt are added thereto, and then the resulting mixture is reacted. The method of adjusting to temperature and adding a base to the mixture adjusted to reaction temperature is mentioned.
The optical purity of the compound (3) obtained by the reaction between the compound (1) and the compound (2) is 40% e.g. when the compound (5) is used as an optically active quaternary ammonium salt. e. 95% e.e. e. Less than, for example, 55% e.e. e. 95% e.e. e. For example 70% e.e. e. 90% e. e. Less than, for example, 75% e.e. e. 85% e. e. Is less than.
The obtained compound (3) may be isolated or may be used in the next step without isolation. In the case of isolation, the reaction mixture after completion of the reaction is subjected to post-treatment such as neutralization, extraction washing, water washing, and concentration, and if necessary, adsorption of activated carbon treatment, silica treatment, alumina treatment, etc. It is subjected to purification treatment such as treatment, recrystallization, distillation and silica gel column chromatography.
Compound (4-2) is obtained by imine hydrolysis of compound (3). Here, imine hydrolysis means a reaction for converting an arylmethylideneamino group of compound (3) into an amino group.
The imine hydrolysis is not particularly limited as long as the ester moiety contained in the compound (3) is not hydrolyzed, and is preferably performed by mixing the compound (3) and an acid.
Examples of the acid used for imine hydrolysis include inorganic acids such as hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid and perchloric acid; aromatic sulfonic acids such as paratoluenesulfonic acid and benzenesulfonic acid; and aliphatics such as methanesulfonic acid. Sulfonic acids; aliphatic carboxylic acids such as acetic acid, propionic acid, citric acid, malic acid, succinic acid, lactic acid, maleic acid and fumaric acid; and phthalic acid, benzoic acid, 4-nitrobenzoic acid and 4-chlorobenzoic acid And aromatic carboxylic acids such as
An acid may be used independently and may be used in mixture of 2 or more types. Moreover, you may use as a mixture with the solvent mentioned later.
The acid is preferably an inorganic acid, more preferably hydrochloric acid. When hydrochloric acid is used, its concentration may be adjusted as appropriate.
In the imine hydrolysis, the amount of acid used is preferably adjusted so that the mixture obtained after mixing with the acid is in the range of pH 0 to pH 4. In order to adjust the pH to such a range, when the acid is hydrochloric acid, for example, 0.8 to 1.5 mol of hydrochloric acid may be used with respect to 1 mol of compound (3).
The imine hydrolysis is preferably performed in a solvent. Examples of the solvent used for imine hydrolysis include the same solvents as those used for the reaction between the above-mentioned compound (1) and compound (2), and water, an aromatic solvent, or an ether solvent is preferable.
The amount of the solvent to be used is preferably 1 to 100 mL, more preferably 3 to 30 mL, per 1 g of compound (3).
The temperature at which imine hydrolysis is carried out is usually within the range of 0 to 80 ° C, preferably within the range of 5 to 60 ° C, and more preferably within the range of 10 to 40 ° C.
The time for performing imine hydrolysis depends on the type and concentration of the acid used and the temperature for performing imine hydrolysis, but is preferably in the range of 1 minute to 20 hours, more preferably in the range of 10 minutes to 10 hours. It is.
The method for mixing the materials in imine hydrolysis is not limited, and examples thereof include a method in which compound (3) and a solvent are mixed and an acid is added to the resulting mixture.
The optical purity of the compound (4-2) obtained by imine hydrolysis is about the same as the optical purity of the compound (3) subjected to imine hydrolysis. That is, when compound (5) is used as the optically active quaternary ammonium salt in the reaction between compound (1) and compound (2), the optical purity of compound (4-2) obtained is, for example, 40% e. e. 95% e.e. e. Less than, for example, 55% e.e. e. 95% e.e. e. For example 70% e.e. e. 90% e. e. Less than, for example, 75% e.e. e. 85% e. e. Is less than.
The resulting compound (4-2) may be isolated or used in the production method of the present invention without isolation. Moreover, after subjecting the reaction mixture obtained by imine hydrolysis to post-treatments such as neutralization, extraction washing, water washing, and concentration, it can also be subjected to the production method of the present invention.

Hereinafter, the present invention will be described in more detail with reference to examples.
<Production Example 1> (Production of (E) -N-phenylmethyleneglycine ethyl ester)
13.8 g (98.9 mmol) of glycine ethyl ester hydrochloride and 50 g of toluene were mixed, 10 g of dimethyl sulfoxide was added thereto at room temperature, and 10.0 g (94.2 mmol) of benzaldehyde was further added. The obtained mixture was stirred at 12 ° C., and 16.5 g of a 25 wt% aqueous sodium hydroxide solution (104 mmol of sodium hydroxide) was added dropwise thereto over 3 hours. After completion of the dropwise addition, the obtained mixture was stirred at 11 to 13 ° C. for 20 hours. After completion of the reaction, the reaction mixture was cooled to 5 ° C., and 11.4 mL of water was added dropwise thereto. Then, stirring was stopped and liquid separation was performed, and the obtained organic layer was washed with 19 g of 20 wt% saline. After the organic layer was dried over magnesium sulfate, the solvent was distilled off under reduced pressure, and 43.6 g of (E) -N-phenylmethyleneglycine ethyl ester in toluene solution ((E) -N-phenylmethyleneglycine ethyl ester content 16.5 g). ) Was obtained (yield 92%).
<Production Example 2> (Production of ethyl 1-amino-2-vinylcyclopropanecarboxylate (abbreviated as ethyl ester A))

2.60 g ((E) -N-phenylmethyleneglycine ethyl ester content: 0.98 g, 5.14 mmol) of toluene solution of (E) -N-phenylmethyleneglycine ethyl ester obtained in Production Example 1 and 10 mL of toluene. Then, 1.00 g (4.68 mmol) of (E) -1,4-dibromo-2-butene and 0.028 g (0.023 mmol) of the compound represented by formula (5-6) were added thereto at room temperature. It was. The obtained mixture was cooled to 0 ° C., and 5.25 g of a 50% aqueous potassium hydroxide solution (46.8 mmol of potassium hydroxide) was added dropwise thereto, followed by stirring at 0 ° C. for 20 hours. After completion of the reaction, 3 mL of water was added to the resulting mixture, stirring was stopped and the liquids were separated, and the obtained organic layer was washed with 3 mL of 20 wt% brine. After separation, an organic layer of a mixture containing more ethyl (1R, 2S) -1- (N-phenylmethylene) amino-2-vinylcyclopropanecarboxylate than its enantiomer was obtained.
Subsequently, 4.7 mL of 1M aqueous hydrochloric acid was added to the obtained organic layer, and the mixture was stirred at room temperature for 2 hours to carry out imine hydrolysis. After completion of the reaction, 3 mL of water was added to the organic layer obtained by liquid separation. In addition, extraction was performed. The obtained aqueous layers were combined to obtain 7.93 g of an aqueous solution of ethyl ester A containing (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylic acid ethyl hydrochloride more than its enantiomer. The obtained aqueous solution was analyzed under the following high performance liquid chromatography analysis conditions and optical purity analysis conditions, and the yield and optical purity of ethyl ester A were calculated. Yield 66%. Optical purity 79% e.e. e.
<High-performance liquid chromatography analysis conditions>
Column: YMC Pack ODS-A-302 (4.6 × 150 mm, 5 μm)
Mobile phase: A = 40 mM KH ₂ PO ₄ water (pH 3.5-H ₃ PO ₄ ),
B = methanol A / B = 10% (0 min) → 10% (5 min) → 70% (25 min) → 70% (45 min)
Flow rate: 1.0 mL / min Detector: Wavelength 220 nm
Retention time: 11.7 minutes (ethyl (1R, 2S) -1- (N-phenylmethylene) amino-2-vinylcyclopropanecarboxylate)
<Optical purity analysis conditions>
Column: CHIRALPAK (registered trademark of Daicel Chemical Industries) AD-RH
(4.6 × 150mm, 5μm)
Mobile phase: A = 20 mM dipotassium hydrogen phosphate aqueous solution (prepared to pH 8.0 with phosphoric acid),
B = acetonitrile A / B = 80/20
Flow rate: 0.5 mL / min Detector: Wavelength 215 nm
Retention time: (1R, 2S) form = 14.7 minutes, (1S, 2R) form = 16.2 minutes <Example 1>
To 8.17 g of an aqueous solution of ethyl ester A (optical purity 79% ee, 3.1 mmol) obtained in Production Example 2, 20 mL of toluene was added at room temperature, and 0.39 g of a 48 wt% aqueous sodium hydroxide solution was further added dropwise. . After dripping, after stirring for 10 minutes, stirring was stopped and liquid-separated and the organic layer was fractionated. To the organic layer, 10 mL of 2-propanol was added and stirred, and 0.46 g (3.1 mmol) of L-tartaric acid was added. The resulting mixture was stirred overnight at room temperature and then the resulting slurry was filtered. The crystals obtained by filtration were washed with a mixed solvent of 2 mL of toluene and 0.5 mL of 2-propanol, and dried under reduced pressure. L-Tartrate of ethyl (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylate 0.81 g (2.6 mmol) was obtained (yield 83%). The obtained crystals were analyzed under the optical purity analysis conditions described in Production Example 2 to determine the optical purity. Optical purity 90% e.e. e.
L-tartrate of ethyl (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylate
¹ H-NMR (CD ₃ OD, 400 MHz) δ ppm: 5.78-5.67 (1H, m), 5.35 (1H, dd, J = 1.4, 17.1 Hz), 5.16 (1H , Dd, J = 1.4, 10.3 Hz), 4.42 (2H, s), 4.30-4.22 (2H, m), 2.34 (1H, q, J = 8.8 Hz) , 1.73-1.64 (2H, m), 1.30 (3H, t, J = 6.8 Hz).
The obtained ethyl (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylate is mixed with L-tartrate, toluene and water, and 25% by weight aqueous sodium hydroxide solution is added dropwise thereto. After stirring the resulting mixture, the organic layer is separated to obtain a toluene solution containing ethyl (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylate. (1R, 2S) -1-Amino-2-vinylcyclopropanecarboxylic acid is mixed with an obtained toluene solution of ethyl (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylate to obtain (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylic acid. The salt of ethyl acid is obtained.
<Production Example 3> (Production of ethyl ester A)
2.60 g ((E) -N-phenylmethyleneglycine ethyl ester content: 0.98 g, 5.14 mmol) of toluene solution of (E) -N-phenylmethyleneglycine ethyl ester obtained in Production Example 1 and 10 mL of toluene. Then, 1.00 g (4.68 mmol) of (E) -1,4-dibromo-2-butene and 0.027 g (0.023 mmol) of the compound represented by formula (5-7) were added thereto at room temperature. It was. The obtained mixture was cooled to 0 ° C., and 5.25 g of a 50 wt% aqueous potassium hydroxide solution (46.8 mmol of potassium hydroxide) was added dropwise thereto and stirred at 0 ° C. for 20 hours. After completion of the reaction, 3 mL of water was added to the resulting mixture, and the organic layer obtained by liquid separation was washed with 3 mL of 20 wt% brine, and (1R, 2S) -1- (N-phenylmethylene) amino- An organic layer containing more ethyl 2-vinylcyclopropanecarboxylate than its enantiomer was obtained.
Subsequently, 4.7 mL of 1M hydrochloric acid was added to the obtained organic layer, and the mixture was stirred at room temperature for 2 hours to carry out imine hydrolysis. After completion of the reaction, 3 mL of water was added to the organic layer obtained by liquid separation. Extraction was performed. The obtained aqueous layers were combined to obtain 7.93 g of an aqueous solution of ethyl ester A containing (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylic acid ethyl hydrochloride more than its enantiomer. The obtained aqueous solution was analyzed under the high performance liquid chromatography analysis conditions and optical purity analysis conditions described in Production Example 2, and the yield and optical purity of ethyl ester A were calculated. Yield 67%. Optical purity 84% e.e. e.
<Example 2>
To 8.25 g of an aqueous solution of ethyl ester A (optical purity 84% ee, 3.1 mmol) obtained in Production Example 3, 20 mL of toluene was added at room temperature, and 0.39 g of 48 wt% aqueous sodium hydroxide solution was added to the mixture. Was dripped. After dropping, the mixture was stirred for 10 minutes and separated to take out the organic layer. 10 mL of 2-propanol was added to the organic layer, 0.73 g (3.1 mmol) of D-10-camphorsulfonic acid was added to the resulting mixture, and the mixture was stirred overnight at room temperature and concentrated under reduced pressure to distill 2-propanol. Crystallized out. The slurry thus obtained was stirred for 2 hours and filtered. The obtained crystals were washed with 2 mL of toluene and dried under reduced pressure. 0.95 g (2.5 mmol) of D-10-camphorsulfonate of ethyl (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylate (Yield 78%). The obtained crystals were analyzed under the optical purity analysis conditions described in Production Example 2 to determine the optical purity. Optical purity 99% e.e. e. D-10-camphorsulfonate of ethyl (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylate
¹ H-NMR (CD ₃ OD, 400 MHz) δ ppm: 5.79-5.69 (1H, m), 5.40 (1H, dd, J = 1.4, 17.1 Hz), 5.23 (1H , Dd, J = 1.4, 10.3 Hz), 4.35-4.23 (2H, m), 2.76 (1H, d, J = 15.1 Hz), 2.70-2.60 ( 1H, m), 2.43-2.28 (2H, m), 2.08-1.96 (2H, m), 1.89 (1H, d, J = 18.6 Hz), 1.82- 1.68 (2H, m), 1.65 to 1.56 (1H, m), 1.45 to 1.36 (1H, m), 1.31 (3H, t, J = 6.8 Hz), 1.12 (3H, s), 0.85 (3H, s).
D-10-camphorsulfonate of ethyl (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylate, toluene and water are mixed, and a 25 wt% aqueous sodium hydroxide solution is added dropwise thereto. After stirring the resulting mixture, the organic layer is separated to obtain a toluene solution containing ethyl (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylate. (1R, 2S) -1-Amino-2-vinylcyclopropanecarboxylic acid is mixed with an obtained toluene solution of ethyl (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylate to obtain (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylic acid. The salt of ethyl acid is obtained.
<Production Example 4> (Production of ethyl ester A)
75.0 g ((E) -N-phenylmethyleneglycine ethyl ester content: 18.8 g, 98.2 mmol) of toluene solution of (E) -N-phenylmethyleneglycine ethyl ester obtained in Production Example 1 and 84 g of toluene (E) -1,4-dibromo-2-butene 20.0 g (93.5 mmol), glycine ethyl ester hydrochloride 1.31 g (9.4 mmol), and the formula (5-1) 0.29 g (0.28 mmol) of the compound to be added at room temperature. The obtained mixture was cooled to 0 ° C, and 42.0 g of a 50 wt% aqueous potassium hydroxide solution (748 mmol of potassium hydroxide) was added dropwise over 3 hours, followed by stirring at 0 ° C for 16 hours. After completion of the reaction, 60 g of water was added to the resulting mixture, stirring was stopped and the liquids were separated, and the obtained organic layer was washed with 60 g of 20 wt% brine. After liquid separation, an organic layer containing more ethyl (1R, 2S) -1- (N-phenylmethylene) amino-2-vinylcyclopropanecarboxylate than its enantiomer was obtained.
Subsequently, after 27.0 g of water was added to the obtained organic layer at room temperature, 8.77 g of 35 wt% hydrochloric acid was added dropwise at room temperature over 20 minutes, and imine hydrolysis was performed at room temperature for 2 hours. After completion of the imine hydrolysis, the aqueous layer was separated, and 18.3 g of 0.5 wt% hydrochloric acid was added to the organic layer at room temperature for extraction. The obtained aqueous layers were combined to obtain 66.6 g of an aqueous solution of ethyl ester A containing (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylic acid ethyl hydrochloride more than its enantiomer. The obtained aqueous solution was analyzed under the high performance liquid chromatography analysis conditions and optical purity analysis conditions described in Production Example 2, and the yield and optical purity of ethyl ester A were calculated. Yield 65%. Optical purity 78% e.e. e.
<Example 3>
10.0 g of an aqueous solution of ethyl ester A (optical purity 78% ee, 9.05 mmol) obtained in Production Example 4 was fractionated, and 12 g of toluene was poured into the separated aqueous solution at room temperature. 1.11 g of a 48 wt% aqueous sodium hydroxide solution was added dropwise. After dropping, the mixture was stirred for 20 minutes, stirring was stopped, and the organic layer was separated. Extraction was performed by adding 3.0 g of toluene to the obtained aqueous layer. The obtained organic layer and the previously separated organic layer were combined and dried over magnesium sulfate, 4.5 g of ethanol was added to the organic layer, and 1.36 g (9.05 mmol) of L-tartaric acid was further added. . The resulting mixture was stirred overnight at room temperature, then cooled in an ice bath and stirred for 5 hours. The obtained slurry was filtered to take out crystals, washed with a mixed solvent of 3.0 g of toluene and 0.3 g of ethanol, and dried under reduced pressure (1R, 2S) -1-amino-2-vinylcyclopropane. 2.09 g (6.85 mmol) of L-tartrate salt of ethyl carboxylate was obtained (76% yield). By analyzing the obtained crystals under the optical purity analysis conditions described in Production Example 2, the optical purity was determined. Optical purity 97% e.e. e. .
<Production Example 5> (Production of ethyl ester A)
141.6 g ((E) -N-phenylmethyleneglycine ethyl ester content: 33.8 g, 177 mmol) of toluene solution of (E) -N-phenylmethyleneglycine ethyl ester obtained in Production Example 1 was mixed with 180 g of toluene. Then, 36.0 g (168 mmol) of (E) -1,4-dibromo-2-butene and 0.53 g (0.51 mmol) of the compound represented by the formula (5-1) were added thereto at room temperature. The obtained mixture was cooled to 0 ° C., and 151 g of a 50 wt% potassium hydroxide aqueous solution (potassium hydroxide 1346 mmol) was added dropwise over 3 hours, followed by stirring at 0 ° C. for 24 hours. After completion of the reaction, 108 g of water was added to the resulting mixture, stirring was stopped and the liquids were separated, and the obtained organic layer was washed with 108 g of 20 wt% brine. After liquid separation, an organic layer containing more ethyl (1R, 2S) -1- (N-phenylmethylene) amino-2-vinylcyclopropanecarboxylate than its enantiomer was obtained.
Subsequently, after 48.6 g of water was added to the obtained organic layer at room temperature, 15.8 g of 35 wt% hydrochloric acid was added dropwise at room temperature over 20 minutes, and imine hydrolysis was performed at room temperature for 2 hours. After completion of imine hydrolysis, the aqueous layer was separated, and 32.4 g of 0.5 wt% aqueous hydrochloric acid solution was added to the organic layer at room temperature for extraction. The obtained aqueous layers were combined to obtain 118.5 g of an aqueous solution of ethyl ester A containing (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylic acid ethyl hydrochloride more than its enantiomer. The obtained aqueous solution was analyzed under the high performance liquid chromatography analysis conditions and optical purity analysis conditions described in Production Example 2, and the yield and optical purity of ethyl ester A were calculated. Yield 64%. Optical purity 76% e.e. e. .
<Example 4>
15.6 g of an aqueous solution of ethyl ester A (optical purity 76% ee) obtained in Production Example 5 (14.9 mmol) was fractionated, and 15 g of isopropyl acetate was added to the separated aqueous solution at room temperature, and an additional 48 wt. A 1.85 g% aqueous sodium hydroxide solution was added dropwise. After the dropwise addition, the resulting mixture was stirred for 20 minutes, and the organic layer was separated. Extraction was performed by adding 5.0 g of isopropyl acetate to the obtained aqueous layer. The organic layer obtained by the extraction and the organic layer separated earlier were combined and dried over magnesium sulfate to obtain an isopropyl acetate solution of ethyl ester A.
Of the obtained solution, 5.97 g was collected (ethyl ester A, 2.96 mmol), and 0.44 g (2.6 mmol) of L-tartaric acid was added thereto and stirred. 2 mL of ethanol was added to the mixture and stirred overnight at room temperature, then cooled in an ice bath and stirred for 2 hours. When the supernatant of the slurry was analyzed under the optical purity analysis conditions described in Production Example 2, the optical purity was 19% e.e. e. Met. By filtering the slurry, an optical purity of 90% e.e. e. The above L-tartrate of ethyl (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylate can be obtained.
<Example 5>
The ethyl ester A (optical purity 76% ee, 17.8 mmol) obtained in Production Example 5 was fractionated, and 18 g of diisopropyl ether was added to the separated aqueous solution at room temperature, followed by stirring. Sodium hydroxide aqueous solution 2.22g was dripped. After dropping, the mixture was stirred for 20 minutes, and the organic layer was separated. Extraction was performed by adding 6.0 g of diisopropyl ether to the obtained aqueous layer. The organic layer obtained by extraction was combined with the previously separated organic layer and dried over magnesium sulfate to obtain a diisopropyl ether solution of ethyl ester A.
Of the resulting solution, 9.46 g was fractionated (ethyl ester A, 5.66 mmol), and the solution was ethanol 2.0 g, 2-propanol 2.0 g and L-tartaric acid 0.85 g (5.66 mmol). The mixture was added dropwise to the mixture at room temperature, stirred at room temperature for 1 hour, further cooled in an ice bath and stirred for 2 hours. When the supernatant of the obtained slurry was analyzed under the optical purity analysis conditions described in Production Example 2, the optical purity was 41% e.e. e. Met. By filtering the slurry, an optical purity of 90% e.e. e. The above crystals can be obtained.
<Example 6>
28.78 g of the aqueous solution of ethyl ester A obtained in Production Example 5 was collected, 26.2 g of toluene was added to the collected aqueous solution at room temperature, and the mixture was stirred. 24 g was added dropwise. After dropping, the mixture was stirred for 30 minutes, and stirring was stopped to separate the organic layer. Extraction was performed by flowing 8.8 g of toluene into the obtained aqueous layer. The organic layer obtained by extraction was combined with the previously separated organic layer, washed with 8.8 g of 20% by weight saline, and dried over magnesium sulfate to obtain a toluene solution of ethyl ester A.
Of the obtained toluene solution, 34.5 g was collected (ethyl ester A, 20.3 mmol), and added dropwise at 30 ° C. to a mixture of 10.5 g of ethanol and 3.50 g (23.3 mmol) of L-tartaric acid. . The resulting mixture was stirred at room temperature for 15 hours. The slurry thus obtained was filtered to take out crystals, and the obtained crystals were washed with a mixed solvent of 7.0 g of toluene and 2.1 g of ethanol and dried under reduced pressure to obtain 5.49 g of crystals. By analyzing the crystals under the quantitative analysis conditions described in Production Example 2, the content of L-tartrate salt of ethyl (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylate was determined. The content of L-tartrate of ethyl (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylate was 5.00 g (16.4 mmol) (yield 81%). By analyzing the obtained crystals under the optical purity analysis conditions described in Production Example 2, the optical purity was determined. Optical purity 94% e.e. e.
Among the obtained crystals, 1.50 g (L-tartrate of ethyl (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylate, content 1.37 g (4.48 mmol)) was fractionated, Ethanol (6.0 g) and methanol (6.0 g) were added to the collected crystals, stirred, and heated in a 40 ° C. bath to dissolve the crystals. The obtained solution was heated in a bath at 40 ° C. and concentrated under reduced pressure to distill off 7 g of the solvent, and the resulting concentrate was ethyl (1R, 2S) -1-amino-2-vinylcyclopropanecarboxylate. Of L-tartrate (optical purity 100% ee). The resulting slurry was cooled to room temperature, and 6.0 g of toluene was added dropwise to the slurry. The slurry was stirred at room temperature for 2 hours, then cooled in an ice bath and stirred for 2 hours. The slurry thus obtained was filtered to take out crystals. The obtained crystals were washed with a mixed solvent of 1.5 g of toluene and 0.75 g of ethanol, dried under reduced pressure, and (1R, 2S) -1-amino-2. -1.08 g (3.54 mmol) of L-tartrate of ethyl vinylcyclopropanecarboxylate was obtained. Yield 79%. By analyzing the obtained crystal under the optical purity analysis conditions described in Production Example 2, the optical purity was determined. Optical purity 100% e. e.

The optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester is useful, for example, as a synthetic intermediate for pharmaceuticals such as antiviral agents.
The present invention is useful because it provides a method for producing an optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester.

Claims

1-amino-2-vinylcyclopropanecarboxylic acid ester is reacted with optically active tartaric acid or optically active camphorsulfonic acid in a solvent, and one diastereomeric salt of the resulting diastereomeric salt mixture is isolated. A process for producing an optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester, wherein the isolated diastereomeric salt is treated with an inorganic acid or base.
1-amino-2-vinylcyclopropanecarboxylic acid ester is represented by the formula (4-2)

(In the formula, R 1 represents an alkyl group having 1 to 12 carbon atoms or an alkenyl group having 2 to 12 carbon atoms.)
And the optically active 1-amino-2-vinylcyclopropanecarboxylic acid ester obtained is represented by the formula (4):

Wherein R 1 is as defined above, C * 1 and C * 2 represent an asymmetric carbon atom, C * 2 is S configuration when C * 1 is R configuration, C * When 1 is in S configuration, C * 2 is in R configuration.)
The method of Claim 1 which is a compound shown by these.
The reaction of 1-amino-2-vinylcyclopropanecarboxylic acid ester with optically active tartaric acid or optically active camphorsulfonic acid is an aromatic solvent, ketone solvent, ester solvent, alcohol solvent, ether solvent, or a mixture thereof. The method according to claim 1, wherein the method is carried out in a medium.
The reaction of 1-amino-2-vinylcyclopropanecarboxylic acid ester with optically active tartaric acid or optically active camphorsulfonic acid is performed in a mixed solvent of an aromatic solvent and an alcohol solvent. Method.
Formula (1)

(In the formula, R 1 represents an alkyl group having 1 to 12 carbon atoms or an alkenyl group having 2 to 12 carbon atoms, and Ar 1 represents an optionally substituted phenyl group or an optionally substituted naphthyl group. To express.)
And a compound of formula (2)

Wherein Y 1 and Y 2 each independently represent a halogen atom, an alkanesulfonyloxy group having 1 to 6 carbon atoms, a perfluoroalkanesulfonyloxy group having 1 to 6 carbon atoms or a benzenesulfonyloxy group. The hydrogen atom contained in the benzenesulfonyloxy group may be independently substituted with a group selected from the group consisting of an alkyl group having 1 to 6 carbon atoms, a halogen atom and a nitro group.
And a compound represented by the formula (3) obtained by reacting in the presence of an optically active quaternary ammonium salt.

(In the formula, Ar 1 and R 1 are as defined above.)
And the compound represented by formula (4-2)

(Wherein R 1 has the same meaning as above).
Then, the compound represented by formula (4-2) is reacted with optically active tartaric acid or optically active camphorsulfonic acid in a solvent, and one diastereomer of the resulting diastereomeric salt mixture is obtained. Formula (4) in which a mer salt is isolated and the isolated diastereomeric salt is treated with an inorganic acid or base

Wherein R 1 is as defined above, C * 1 and C * 2 represent an asymmetric carbon atom, C * 2 is S configuration when C * 1 is R configuration, C * When 1 is in S configuration, C * 2 is in R configuration.)
The manufacturing method of the compound shown by these.
An optically active quaternary ammonium salt has the formula (5)

(Wherein, Ar 2 and Ar 2 'are each independently, .Ar 3 representing a phenyl group which may be substituted is an aromatic hydrocarbon group or substituted optionally substituted 6 carbon atoms also be ~ 20 R 2 represents an optionally substituted aliphatic hydrocarbon group having 1 to 12 carbon atoms, and R 3 represents an optionally substituted aliphatic hydrocarbon group having 1 to 20 carbon atoms. 12 represents a straight-chain hydrocarbon group, or R 2 and R 3 together form a polymethylene group having 2 to 6 carbon atoms: R 4 , R 4 ′ , R 5 , R 5 ′ , R 6 and R 6 ′ each independently represents a hydrogen atom, an aliphatic hydrocarbon group having 1 to 12 carbon atoms or an alkoxy group having 1 to 12 carbon atoms, * represents an asymmetric carbon atom, X − Represents a monovalent anion.)
The method of Claim 5 which is an optically active compound shown by these.
Ar 2 and Ar 2 ′ are both 3,5-bis (trifluoromethyl) phenyl groups, R 6 and R 6 ′ are both hydrogen atoms, and R 2 and R 3 are each independently of 1 to The method of claim 6, which is 12 alkyl groups.
Ar 3 is an aromatic hydrocarbon group having 6 to 20 carbon atoms having an alkoxy group having 1 to 12 carbon atoms or an aliphatic hydrocarbon group having 1 to 20 carbon atoms having an alkoxy group having 1 to 12 carbon atoms Item 7. The method according to Item 6.
(1R, 2S) -1-amino-2-vinylcyclopropanecarboxylic acid ester or (1S, 2R) -1-amino-2-vinylcyclopropanecarboxylic acid ester and optically active tartaric acid or optically active camphorsulfonic acid And salt.